Checker bar



J. H. SAMPLE.

CHE CKER BAR. v APPLICATION FILED JAN. 10. I921.

Patented Aug. 15, 1922 1 VEN DR annexes BAR.

To all 107mm it may concern."

Be it known that I, JOHNTI. SAMPLE, a citizen of the United'States, and a resident of Toledo, in the county of Lucas and State ofOhio, have made an Invention Appertainmg to Checker Bar; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention has for its object to provide a convenient checker bar for checking the dimensions of castings or patterns for articles or devices of different kinds with drawings or specifications. V

The invention may be contained in struc tures of different forms, and to illustrate a practical application of the invention I have selected a checker bar containing the invention as an example. The checker bar selected is shown in the accompanying drawings.

Figure l of the drawings illustrates a perspective view of the checker bar. Fig. 2 illustrates the checker bar and the manner of using it in checking a casting or a pattern.

1 in the figures is a bar, preferably made of metal, that is pivotally supported on a standard 2. It has a bracket 3, and a pivot pin 4 extends through the standard and the bracket 3. The pivot pin 4 may be provided with a handle 16 whereby the bracket 3 may be clamped in a slot formed in the standard 4, and the bar may thus be rigidly held in an upright position. One end of the bar extends beyond the standard 2 so that when the bar 1 is raised to an upright position the end of the bar 1 will strike the head of the screw 5 which is threaded into the standard 2. The checker bar may thus be placed in a vertical or plumb line position by the proper adjustment of the screw 5.

The checker bar is provided with a leg 6 which will place the checker bar in a horizontal position when the leg 6 is placed so as to rest on a table or other object on which the standard 2 is placed. The leg 6 is slightly higher than the standard 2 so as to place the checker bar substantially in a. horizontal. position on the table. The checker bar may be provided with a blackened upper surface 7 by any suitable means such as by lamp black mixed with shellac or any other suit on the checker bar.

Specification of Letters Patent. Pfltgllted Ati 15 Application filed January 10, 1921'.- Serial No. 436,066. I l

able material. The face, moreover, is deeply scored or groove-d, as by the l1nes-8 to divide the face of the checker barinto'a plurality of parts. This extends the utilityof 'th e checker "bar in that it avoids confusion'of indicating lines. grooves and between the grooves and the edges of the checker bar may be used for checking different things, or differentparts of the same'thing, or checking the same thing when put in different positions on a The spaces between the face plate. The face of the checker bar is blackened so as to render markings bycom passes readily discernible.

v The checker bar is-also' provided with a saddle 9 which extends around the checker 1 bar and may be clamped in any position by means of the screw 10. The saddle has a plurality of pairsof holes, each pair being usable for a space in which the face of the checker bar is divided. Some of the holes, such as the holes 11, extend but a short distance into the metal of the saddle, while the holes 12 extend through the metal of the saddle. The holes 11 form recesses for holding one of the points of the compasses that are used to mark the'checker bar ofit' when the dimensions are taken from the drawing or from specifications, or from another article or object with which an article or object is to be compared. The holes 12 are sight.

holes so as to place the saddle on a definite predetermined line that may be marked across the face of the checker bar or across only one of the divisions of the checker bar. These lines are sometimes termed zero lines, that is, they are the lines from which the measurements are taken, such as a center line of a shaft. or a center line of a casting. hen a center line has been determined, the measurements to certain points of the article to be produced are marked on the checker bar, and in order that a plurality of sets of such marks may be made preparatory to checking the article produced with a blue print or a specification different zero lines may be used, and the different sets of markings may be placed in'the different spaces of the face of the checker bar. 1

The checker bar is then placed on a face plate such as the plate 13, and a surface gauge 14 is set to any particular mark made The point of thechecker 1 bar is then'turned to the object, such as the.

casting 15, to ascertain whether or not the casting'has been-correctly made, or has the particular measurement specified. In this Way the measurements of the different parts of the casting 15 may be checked.

I claim:

1. In a checker bar a standard, a bar pivotally supported by the standard, a saddle supported on the bar and having holes.

2. In a checker bar a standard, a bar pivotally supported by the standard, a saddle supported on thebar and having holes extendingthroughthe saddle, and holes extending a short distance into the metal of the saddle.v

3. In a checker bar a standard, a bar pivotally'supported by the standard, a saddle supported on the bar and having holes extending through the saddle, and holes extending a short distance into the metal of the saddle, the holes arranged in pairs, and the checker bar having scorings extending the length of the checker bar, and located between the pairs of holes.

4. In a checker bar a standard, a bar-pivotal lysupported by the standard, a saddle supported on the bar and having holes 6X,

tending, throughthe saddle, and holesextending a short distance into the metal of the saddle, the holes arranged in pairs, and the checker bar having scoring extending the length of the checker bar, and located between thepairs of holes, the surface of the checker bar being coated by a material to render scratches on the face of the checker bar discernible.

5. In a checker bar a standard, a bar pivotally supported by the standard, a saddle supported on the bar and having holes er:- tending through the saddle, and holes extending a short distanceinto the metal of the saddle, the holes arranged in pairs, and the,

checker bar having scorings extending the length oi the checker bar, and locatedbe tween thepairs of holes, the surface of the,

checker bar being coated by a materialto render scratches on the face of the checkerbar discernible, an adjustable screw and a clamping means for-securing the checker bar in upright position.

In testimony whereof, I have hereunto signed my name. to this specification.

JOHN SAMPLE. 

